New Zealand Prime Minister Jacinda Ardern said Monday she would announce new gun laws within days, after at least 50 people were killed in mass shootings at two mosques in the city of Christchurch.

Australian Brenton Tarrant, 28, a suspected white supremacist, was charged with murder Saturday. Tarrant was remanded without a plea and is due back in court on April 5, where police said he was likely to face more charges.

"Within 10 days of this horrific act of terrorism we will have announced reforms which will, I believe, make our community safer," Ardern said at news conference after her Cabinet reached in principle decisions on gun reform laws in the wake of New Zealand's worst-ever mass shooting.